G76 Problem on SMX3100

I am having trouble getting a G76 cycle to work. I am trying to produce a 1.250-16UN-2A external thread.

I am running the tool above the workpiece until I’m happy. At the moment the tool is coming down to the first cut diameter and then running back and forward to the Z depth but without lifting up on the diameter or changing diameter at all.

I have compared my program with previous proven programs and it has the same code. I am not sure what is going wrong this time.

I have a screenshot of the code which I will try and post. Any help would be much appreciated. On the SMX3100 the P and Q values on the second G76 line have an extra digit than normal. This is correct on this machine.

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